● A noun that changes form when its grammatical case changes is declinable (muʿrab), while one that always remains in one form is indeclinable (mabnī).
● A declinable noun is either fully declinable or a diptote.
● A diptote never takes tanwīn or kasrah at the end; its accusative and genitive forms take fatḥah.
● Men's names ending in round tāʾ, women's names, and the names of angels, countries, and most prophets are diptotes.
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Level Summary
Declinable and Indeclinable Nouns: Fully Declinable and Diptote
● A noun that changes form when its grammatical case changes is declinable (muʿrab), while one that always remains in one form is indeclinable (mabnī).
● A declinable noun is either fully declinable or a diptote.
● A diptote never takes tanwīn or kasrah at the end; its accusative and genitive forms take fatḥah.
● Men's names ending in round tāʾ, women's names, and the names of angels, countries, and most prophets are diptotes.